package com.hmdp.service.impl;

import com.hmdp.dto.Result;
import com.hmdp.entity.SeckillVoucher;
import com.hmdp.entity.Voucher;
import com.hmdp.entity.VoucherOrder;
import com.hmdp.mapper.VoucherOrderMapper;
import com.hmdp.service.ISeckillVoucherService;
import com.hmdp.service.IVoucherOrderService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.service.IVoucherService;
import com.hmdp.utils.RedisIdWorker;
import com.hmdp.utils.SimpleRedisLock;
import com.hmdp.utils.UserHolder;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.aop.framework.AopContext;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.time.LocalDateTime;

/*
* @Description: TODO
* @Author: YangTing
* @Date: 2023/5/22 15:41
**/
@Service
public class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {

    @Resource
    private ISeckillVoucherService seckillVoucherService;

    @Resource
    private RedisIdWorker redisIdWorker;

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Resource
    private RedissonClient redissonClient;

    @Override
    public Result seckillVoucher(Long voucherId) {
        SeckillVoucher voucher = seckillVoucherService.getById(voucherId);
        if (voucher.getBeginTime().isAfter(LocalDateTime.now())) {
            return Result.fail("秒杀尚未开始,敬请期待~");
        }
        if (voucher.getEndTime().isBefore(LocalDateTime.now())) {
            return Result.fail("抢购结束啦,下次加油吧！");
        }
        if (voucher.getStock() < 1) {
            return Result.fail("已被抢购完,下次加油吧~");
        }
        Long userId = UserHolder.getUser().getId();

        //锁对象
//        SimpleRedisLock lock = new SimpleRedisLock("order:" + userId, stringRedisTemplate);
        RLock lock = redissonClient.getLock("lock:order:" + userId);
        boolean isLock = lock.tryLock();
        if (!isLock) {
            return Result.fail("不允许重复下单~");
        }
        try {
            IVoucherOrderService proxy = (IVoucherOrderService) AopContext.currentProxy();
            return proxy.createVoucherOrder(voucherId);
        } finally {
            lock.unlock();
        }
    }

    @Transactional
    public synchronized Result createVoucherOrder(Long voucherId) {
        Long userId = UserHolder.getUser().getId();

            Integer count = query().eq("user_id", userId).eq("voucher_id", voucherId).count();
            if (count > 0) {
                return Result.fail("用户已经购买过啦~");
            }

            //库存减一
//        voucher.setStock(voucher.getStock() - 1);
//        seckillVoucherService.saveOrUpdate(voucher);
            boolean success = seckillVoucherService.update()
                    .setSql("stock = stock -1")
                    .eq("voucher_id", voucherId)
                    .gt("stock", 0)
                    .update();
            if (!success) {
                return Result.fail("库存不足啦!");
            }

            VoucherOrder voucherOrder = new VoucherOrder();

            Long orderId = redisIdWorker.nextId("order");
            voucherOrder.setId(orderId);
            voucherOrder.setVoucherId(voucherId);
            voucherOrder.setUserId(userId);
            voucherOrder.setCreateTime(LocalDateTime.now());
            save(voucherOrder);
            return Result.ok(orderId);
        }
}
